Guralp-systems CMG-3T Manuel d'utilisateur télécharger pdf (Page 39)

Operator's guide

Again, you can use the BUSY LED to monitor the progress of

unlocking.

1. The instrument checks to see whether the Z, N/S and E/W

masses are locked.

2. The instrument checks the N/S and E/W sensor bases.

3. The Z component is unlocked.

4. The N/S and E/W components are unlocked. These are quicker

than the Z component.

5. (see graph below) The N/S sensor base is unlocked, followed by

the E/W base. These processes take longer still.

• After unlocking, the instrument automatically performs a round

of centring (see below).

CENTRE

This command re-centres the masses. If the masses are clamped, or if

the sensor mass positions do not exceed ± 1.2 V, the CENTRE

command does nothing. Otherwise, it attempts to zero the output of

the vertical, N/S and E/W sensors in sequence by exerting small extra

forces on the boom. For the vertical sensor, a motor-driven adjuster

presses a small spring lever against the boom until the mass position

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Guralp-systems CMG-3T Manuel d'utilisateur Page 39